refactor server impl and add support for alpn http2 negotiation

README.md

@@ -13,14 +13,25 @@ Actix web is licensed under the [Apache-2.0 license](http://opensource.org/licen
 
 ## Features
 
-  * HTTP/1 and HTTP/2 support
-  * Streaming and pipelining support
-  * Keep-alive and slow requests support
-  * [WebSockets support](https://actix.github.io/actix-web/actix_web/ws/index.html)
+  * HTTP/1 and HTTP/2
+  * Streaming and pipelining
+  * Keep-alive and slow requests handling
+  * [WebSockets](https://actix.github.io/actix-web/actix_web/ws/index.html)
   * Configurable request routing
   * Multipart streams
   * Middlewares
 
+## HTTP/2 Negotiation
+
+To use http/2 protocol over tls without prior knowlage requires 
+[tls alpn]( (https://tools.ietf.org/html/rfc7301). At the moment only
+rust-openssl supports alpn.
+
+```toml
+[dependencies]
+actix-web = { git = "https://github.com/actix/actix-web", features=["alpn"] }
+```
+
 ## Usage
 
 To use `actix-web`, add this to your `Cargo.toml`: